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Question

# The speed of motor boat in still water 20 km/hr and river flow is 5 km/hr. A float is dropped from the boat when it start moving upstream. After moving 1.5 km the boat returns back. The boat will catch the float (from initial instant) after

A
6 min
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B
12 min
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C
10 min
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D
15 min
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Solution

## The correct option is B 6 min Speed of boat in upstream = 15 km/hr Distance = 1.5 km Time = t1=1.515 = 6 min Distance move by float in this time 5×110=12 km Speed of boat w.r.t. float, 20km/hr,t2=2 km20 = 6 min.

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